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· Rod pump can be pulled out from the well directly

· Well inspection and workover is convenient

· Reduce the cost of pumping test

· Suitable for deeper well

· The structure is simple but strong and durable

· The price is low

· Has a high fluid production in the same diameter tubing

· Suitable for the deeper well

· The pump reaches the advanced level in the world

· Has good anti-corrosion performance

· Easy to maintain and save time

· Has the largest pump bore and fluid production

· Unique outside work barrel and plunger rotator

· Valve ball has a compulsive restoration structure

· Suitable for whose oblique angle does not exceed 45°

· Has a good anti-corrosion property

· Indeed, combined by two different diameter pumps

· Uses the hydraulic feedback theory, reduce the broken off of sucker rod

· Long service life

· Very good anti-corrosion property

· Adopt long plunger and short barrel structure

· Use the sand scraping and sealing device

· Prevent the sand from burying the plunger

· Suitable the oil well, which the sand content less than 3%